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Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Related Experiment Video

Updated: Mar 6, 2026

Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid
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Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid

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Subwavelength imaging with a zero-mass sonic meta-atom.

Thibaut Devaux1,2, Eun Bok3,4, Jong J Park5

  • 1Division of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan.

Science Advances
|March 4, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel acoustic imaging platform using a sonic meta-atom probe. It achieves super-resolved imaging by capturing evanescent waves, enabling detailed texture analysis and non-contact scanning.

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Area of Science:

  • Acoustics
  • Metamaterials
  • Nanotechnology

Background:

  • Acoustic metamaterials enable sound manipulation at subwavelength scales.
  • Super-resolved acoustic imaging requires accessing evanescent waves beyond the diffraction limit.
  • Near-field techniques with subwavelength probes capture evanescent waves for fine object detail.

Purpose of the Study:

  • Introduce an experimental platform for super-resolved acoustic imaging.
  • Utilize airborne extraordinary transmission to couple evanescent acoustic waves.
  • Develop a subwavelength, zero-mass sonic meta-atom probe.

Main Methods:

  • Harnessing airborne extraordinary transmission to couple evanescent waves.
  • Employing a sonic meta-atom probe with a circular membrane on a waveguide tip.
  • Exploiting the sonic Drexhage effect for resonant frequency downshift.

Main Results:

  • Demonstrated extreme subwavelength imaging by measuring the waveguide's acoustic reflection coefficient.
  • Achieved lateral resolution of approximately [Formula: see text] and depth resolution of approximately [Formula: see text].
  • Showcased capabilities for texture measurement and non-contact scanning.

Conclusions:

  • The developed platform enables extreme subwavelength acoustic imaging.
  • The sonic meta-atom probe effectively captures evanescent waves for high-resolution imaging.
  • The technology offers advanced capabilities for material characterization and scanning.